Which of the 24 solar terms is the summer solstice?

1, summer solstice is the tenth of the 24 solar terms.

2. Every year on June 2 1 or 22 of Gregorian calendar, when the sun moves to 90 degrees of the yellow meridian, it is regarded as the summer solstice. At this time, the position of the sun directly on the ground reaches the northernmost point of the year, almost directly on the Tropic of Cancer, and the sunshine time in the northern hemisphere is the longest. After the summer solstice, Yin Qi began to grow and Yang Qi began to decline.